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(1) 地球を中心を通って太陽放射と垂直な面で切った時の断面積は πR² [m²] だから
1.4[kW/m²] × πR²[m²]
(2)
地球表面は 4πR² だから
1.4πR²/4πR² =1.4/4
太陽定数 1.4の 1/4 だから 0.25

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